MarkT:
Look carefully at the pictures - 3 of the 6 holes are linked to the groundplane.
True.
But the three shunts are connected to the other three holes.
And shunt common goes to a different hole on the side of the board.
It seems that this board is designed for three loads, connected to those six "power/ground" vias.
And that 'power-in/ground' is on the side of the board.
I wonder how much current those thin shunt traces can take before evaporating.
Leo..